

are rolling release distros stable enough
I’ve been using Arch (or some flavor of it) for several years, and I’ve never had any serious issues that I didn’t cause myself. The thing that might catch you with your pants down is if a dependency introduces a change that breaks another application, but catastrophic failures are fairly rare, as long as you’re willing to learn how to maintain your system.
is it possible/easy to roll back to a previous version
Yes. The application is called Timeshift, and it’s specifically designed to back up the system files to a separate partition. If your root filesystem is btrfs, it can also manage filesystem-level snapshots that you can roll back if you bugger the system.
Americans will do anything to avoid just using trains.